Process for treating keratin fibers using an anhydrous composition comprising a compound of azomethine type comprising two pyrazolopyridine units and an aqueous composition

A process for dyeing keratin fibers, in particular human keratin fibers, which comprises mixing together at least compositions (1) and (2), wherein:

• composition (1) is anhydrous and comprises one or more dyes selected from dyes of azomethine type comprising two pyrazolopyridine units of formulae (I) and (II) below:
• wherein in formulae (I) and (II):
• Z1 represents an oxygen atom or a group —N(R6)—;
• Z′1 represents an oxygen atom or a group —N(R′6)—;
• when Z1 represents —N(R6)— and/or Z1 represents —N(R′6)— then R1 and R6 and/or R′1 and R′6, respectively, may form, together with the nitrogen atom to which they are attached, an optionally substituted, 5- to 8-membered, optionally cationic, saturated, unsaturated or aromatic heterocycle;
• R1, R′1, R6, and R′6 each independently represent:
• a hydrogen atom,
• a C1-C10 alkyl radical optionally interrupted with one or more non-adjacent heteroatoms, and/or optionally substituted;
• R2, R3, R4, R5, R′2, R′3, R′4 and R′5 each independently represent:
• a hydrogen atom,
• an optionally substituted C1-C4 alkyl radical;
• a group selected from —NH2, —N(H)R10, —N(R11)R12, OH or —OR9, with R9 and R10 representing an optionally substituted, linear or branched C1-C6 alkyl, R11 and R12, which may be identical or different, representing an optionally substituted, linear or branched C1-C6 alkyl, wherein R11 and R12 optionally form, together with the nitrogen atom to which they are attached, a saturated, unsaturated or aromatic 5- to 8-membered heterocycle optionally containing one or more other heteroatoms or groups selected from N, O, S, S(O)2 or C(O), the heterocycle being optionally substituted, and/or
• R2, R3, R4, R5, R′2, R′3, R′4 and R′5 form, in pairs with adjacent radicals, an optionally substituted, saturated or unsaturated (hetero)cycle;
• wherein when the compound of formula (I) or (II) is positively charged, then it comprises as many anionic counterions as cationic charges to achieve the electrical neutrality of the molecule;
• and
• composition (2) is aqueous, and comprises one or more ingredients selected from:
• i) hydrotropic solvents;
• ii) anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof;
• iii) anionic, cationic, nonionic, amphoteric or zwitterionic, optionally associative, optionally substantive, polymers, or blends thereof;
• wherein composition (2) does not comprise any dye (I) or (II).

A device or kit comprising at least two compartments separate from one another comprising, composition (1) in a first compartment and composition (2) in a second compartment, wherein:

• composition (1) is anhydrous and comprises one or more dyes selected from dyes of azomethine type comprising two pyrazolopyridine units of formulae (I) and (II) below:
• wherein in formulae (I) and (II):
• Z1 represents an oxygen atom or a group —N(R6)—;
• Z′1 represents an oxygen atom or a group —N(R′)—;
• when Z1 represents —N(R6)— and/or Z′1 represents —N(R′6)— then R1 and R6 and/or R′1 and R′6, respectively, may form, together with the nitrogen atom to which they are attached, an optionally substituted, 5- to 8-membered, optionally cationic, saturated, unsaturated or aromatic heterocycle;
• R1, R′1, R6, and R′6 each independently represent:
• a hydrogen atom,
• a C1-C10 alkyl radical optionally interrupted with one or more non-adjacent heteroatoms, and/or optionally substituted;
• R2, R3, R4, R5, R′2, R′3, R′4 and R′5 each independently represent:
• a hydrogen atom,
• an optionally substituted C1-C4 alkyl radical;
• a group selected from —NH2, —N(H)R10, —N(R11)R12, OH or —OR9, with R9 and R10 representing an optionally substituted, linear or branched C1-C6 alkyl, R11 and R12, which may be identical or different, representing an optionally substituted, linear or branched C1-C6 alkyl, wherein R11 and R12 optionally form, together with the nitrogen atom to which they are attached, a saturated, unsaturated or aromatic 5- to 8-membered heterocycle optionally containing one or more other heteroatoms or groups selected from N, O, S, S(O)2 and C(O), the heterocycle being optionally substituted, and/or
• R2, R3, R4, R5, R′2, R′3, R′4 and R′5 form, in pairs with adjacent radicals, an optionally substituted, saturated or unsaturated (hetero)cycle;
• wherein when the compound of formula (I) or (II) is positively charged, then it comprises as many anionic counterions as cationic charges to achieve the electrical neutrality of the molecule;
• and
• composition (2) is aqueous, and comprises one or more ingredients selected from:
• i) hydrotropic solvents;
• ii) anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof;
• iii) anionic, cationic, nonionic, amphoteric or zwitterionic, optionally associative, optionally substantive, polymers, or blends thereof;
• wherein composition (2) does not comprise any dye (I) or (II).